IMac as Secondary Thunderbolt Display

Hi, I'm wondering if anyone knows how I might resolve these issues. I have a new 2013 27" iMac and have connected another new 27" iMac via Thunderbolt to use as a second display. I have two issues:
1. I have to press Command+F2 to use the iMac as a secondary monitor, even after waking up from sleep. I do not want to have to do this all the time, as that means I always need to have another keyboard sitting on my desk hooked up to it. Is there a way to keep target display mode active even through sleeping?
2. The secondary iMac's screen will turn black for half a second or so about every 10 minutes. The time interval seems to vary. I am assuming this is a thunderbolt connection issue, but I've tried different cables and it does the same thing.
Both iMacs have Mountain Lion on them.
Thanks in advance.

Thanks for your reply, but that does not help.
I used that article to originally set up the iMac as a secondary display.
My questions are not solved by that article.

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